Parasites of juvenile alosids as biological indicators
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One hundred and fifty-six juvenile alosids (sixty-one Alosa sapidissima, forty-seven Alosa pseudoharengus and forty-eight Alosa aestivalis) were necropsied for parasitological examination. Twenty metazoan parasites from the following taxa were recovered: one Monogenea, four Digenea, two Cestoda, seven Nematoda, one Nematomorpha, one Acanthocephala, and four Copepoda. The fish were arbitrarily divided into three geographical groups based on location of capture in coastal Atlantic waters. Three measures: the Shannon-Weaver index of diversity, an Equitability index and Simpson's index were used to compare the parasite assemblages of these groups. Analysis of the data demonstrates that distinct differences exist between the parasite assemblages of these groups and suggests the feasibility of using these assemblages as indicators for stock discrimination.
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